Function trim_i8_encode 

pub fn trim_i8_encode(f: &[i8], nbits: u32, d: &mut [u8]) -> usize

Encode small integers into bytes, with a fixed size per value.

Encode the provided sequence of signed integers f, with nbits bits per value, into the destination buffer d. The actual number of written bytes is returned. If the total encoded size is not an integral number of bytes, then extra padding bits of value 0 are used.